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Nature Communications May 2024The coronavirus disease 2019 (COVID-19) pandemic, along with the implementation of public health and social measures (PHSMs), have markedly reshaped infectious disease...
The coronavirus disease 2019 (COVID-19) pandemic, along with the implementation of public health and social measures (PHSMs), have markedly reshaped infectious disease transmission dynamics. We analysed the impact of PHSMs on 24 notifiable infectious diseases (NIDs) in the Chinese mainland, using time series models to forecast transmission trends without PHSMs or pandemic. Our findings revealed distinct seasonal patterns in NID incidence, with respiratory diseases showing the greatest response to PHSMs, while bloodborne and sexually transmitted diseases responded more moderately. 8 NIDs were identified as susceptible to PHSMs, including hand, foot, and mouth disease, dengue fever, rubella, scarlet fever, pertussis, mumps, malaria, and Japanese encephalitis. The termination of PHSMs did not cause NIDs resurgence immediately, except for pertussis, which experienced its highest peak in December 2023 since January 2008. Our findings highlight the varied impact of PHSMs on different NIDs and the importance of sustainable, long-term strategies, like vaccine development.
Topics: Humans; COVID-19; China; SARS-CoV-2; Communicable Diseases; Pandemics; Incidence; Seasons; Public Health; Communicable Disease Control
PubMed: 38719858
DOI: 10.1038/s41467-024-48201-8 -
Comparative Immunology, Microbiology... Jul 2024Japanese encephalitis virus (JEV) is a major cause of encephalitis in Southeast Asia. Tamil Nadu, a state located in the southern part of India, contributes...
Japanese encephalitis virus (JEV) is a major cause of encephalitis in Southeast Asia. Tamil Nadu, a state located in the southern part of India, contributes substantially to the national burden of human JE cases every year. However, limited information is available on the epidemiology of JE in pig populations of Tamil Nadu. A cross-sectional study was conducted to assess JEV prevalence in pig populations of Tamil Nadu. A total of 710 pigs reared in 118 farms across 10 districts of Tamil Nadu were sampled using multistage cluster random sampling. Serum samples were analyzed for their JEV status using Immunoglobulin M (IgM) and Immunoglobulin G (IgG) Enzyme-Linked Immunosorbent Assay (ELISA). At the animal-level, the apparent JEV seroprevalence was 60.4% (95% CI: 56.8% - 64.0%) and the true seroprevalence was 50.1% (95% CI: 47.0% - 53.2%). The herd-level apparent seroprevalence was 94.1% (95% CI: 88.1% - 97.5%) and the true seroprevalence was 93.3% (95% CI: 89.5% - 96.2%). The intensity of JEV circulation was high in all the districts, with seroprevalence ranging between 43% and 100%. Pigs across all age categories were seropositive and a high overall seroprevalence of 95.2% (95% CI: 76.2% - 99.9%) was recorded in pigs older than 12 months. JEV seropositivity was recorded in all the seasons but the prevalence peaked in the monsoon (67.9%, 95% CI: 61.1% - 74.2%) followed by winter (65.1%, 95%CI: 57.4% - 72.2%) and summer (53.3%, 95% CI: 47.8% - 58.8%) seasons. The results indicate that JEV is endemic in pigs populations of the state and a one health approach is essential with collaborative actions from animal and public health authorities to control JE in Tamil Nadu, India.
Topics: Animals; India; Seroepidemiologic Studies; Encephalitis Virus, Japanese; Encephalitis, Japanese; Swine; Swine Diseases; Cross-Sectional Studies; Antibodies, Viral; Immunoglobulin G; Immunoglobulin M; Prevalence; Female; Enzyme-Linked Immunosorbent Assay; Male; Seasons
PubMed: 38718722
DOI: 10.1016/j.cimid.2024.102189 -
Journal of Vector Borne Diseases May 2024Mosquito-borne diseases are increasing problems in various parts of the world, causing high mortality and morbidity for humans. This study was done to assess the vector...
BACKGROUND OBJECTIVES
Mosquito-borne diseases are increasing problems in various parts of the world, causing high mortality and morbidity for humans. This study was done to assess the vector protection measures taken by rural BPL (below-poverty-line) families, and to assess the awareness about vector-borne diseases along with Total Sanitation Campaign (TSC) in rural BPL families.
METHODS
A cross-sectional study was conducted in rural areas, which won Nirmal Gram Puraskar Award, among 96 BPL families for a period of three months. These families (every 5th) were selected by systematic random sampling until we reached a sample size. Basic sociodemographic details, status of vector protection measures, solid waste management, vector- borne diseases and total sanitation campaign details were collected from the study participants. Pre-tested, semi-structured questionnaire was applied to the head of the families which included sanitation status at home by a house-to-house visit. The data collected was analysed using SPSS version 20. Data was presented as frequency, percentages, mean and SD.
RESULTS
Among 96 families (454 adults and children) studied 84 (87.5%) were males and 12 (12.5%) were females. 291 (64.1%) were using one or the other mosquito protection measures, 52 (54.2%) were using bednets and 23 (23.9%) were using coils. 12 families (12.5%) were not using any mosquito protection measures. In our study, 66 (68.8%) families had individual household latrine (IHHL) and 50 (52.1%) had open drainage. Even though 314 participants had an access to individual household latrine, 20 (6.36%) had practice of open-air defecation compared to 127 (90.7%) who practiced open-air defecation without an access to individual household latrine. When asked about the awareness regarding vector-borne diseases, 56 (58.3%) were aware about chikungunya, 47 (48.9%) about dengue, 46 (47.9%) about malaria, 14 (14.6%) and only 5 (5.2%) families were aware about Japanese encephalitis. In this study, 37 (38.5%) were aware about the total sanitation campaign and 40 (41.6%) were aware about government support for sanitation.
INTERPRETATION CONCLUSION
While there is a general awareness of vector-borne diseases, the implementation of vector protection measures is not uniform across the village. There is a need for targeted interventions to improve the effectiveness of vector protection measures and increase awareness among the community.
PubMed: 38712708
DOI: 10.4103/JVBD.JVBD_27_24 -
BioRxiv : the Preprint Server For... Apr 2024Japanese Encephalitis Virus (JEV) transmission in temperate Australia has underscored a critical need to characterise transmission pathways and identify probable hosts...
Japanese Encephalitis Virus (JEV) transmission in temperate Australia has underscored a critical need to characterise transmission pathways and identify probable hosts of infection within the country. This systematic review consolidates existing research on the vertebrate hosts of JEV that are known to exist in Australia. Specifically, we aim to identify probable species for JEV transmission, their potential role as either a spillover or maintenance host and identify critical knowledge gaps. Data were extracted from studies involving experimental infection, seroprevalence, and virus isolation and were available for 22 vertebrate species known to reside in Australia. A host competence score was calculated to assess the potential for a given species to infect JEV vectors and to quantity their possible role in JEV transmission. Based on the host competence score and ecology of each species, we find ardeid birds, feral pigs, and flying foxes have potential as maintenance hosts for JEV in the Australian context. We also note that brushtail possums and domestic pigs have potential as spillover hosts under certain outbreak conditions. However, evidence to confirm these roles in localized transmission or outbreaks is sparse, emphasizing the need for further targeted research. This review provides a foundation for future investigations into JEV transmission in Australia, advocating for enhanced surveillance and standardized research methodologies to better understand and mitigate the virus's impact.
PubMed: 38712158
DOI: 10.1101/2024.04.23.590833 -
SAGE Open Medicine 2024Arboviruses are RNA viruses and some have the potential to cause neuroinvasive disease and are a growing threat to global health. (Review)
Review
BACKGROUND
Arboviruses are RNA viruses and some have the potential to cause neuroinvasive disease and are a growing threat to global health.
OBJECTIVES
Our objective is to identify and map all aspects of arbovirus neuroinvasive disease, clarify key concepts, and identify gaps within our knowledge with appropriate future directions related to the improvement of global health.
METHODS
: A scoping review of the literature was conducted using PubMed, Scopus, ScienceDirect, and Hinari. : Original data including epidemiology, risk factors, neurological manifestations, neuro-diagnostics, management, and preventive measures related to neuroinvasive arbovirus infections was obtained. Sources of evidence not reporting on original data, non-English, and not in peer-reviewed journals were removed. : An initial pilot sample of 30 abstracts were reviewed by all authors and a Cohen's kappa of = 0.81 (near-perfect agreement) was obtained. Records were manually reviewed by two authors using the Rayyan QCRI software.
RESULTS
A total of 171 records were included. A wide array of neurological manifestations can occur most frequently, including parkinsonism, encephalitis/encephalopathy, meningitis, flaccid myelitis, and Guillain-Barré syndrome. Magnetic resonance imaging of the brain often reveals subcortical lesions, sometimes with diffusion restriction consistent with acute ischemia. Vertical transmission of arbovirus is most often secondary to the Zika virus. Neurological manifestations of congenital Zika syndrome, include microcephaly, failure to thrive, intellectual disability, and seizures. Cerebrospinal fluid analysis often shows lymphocytic pleocytosis, elevated albumin, and protein consistent with blood-brain barrier dysfunction.
CONCLUSIONS
Arbovirus infection with neurological manifestations leads to increased morbidity and mortality. Risk factors for disease include living and traveling in an arbovirus endemic zone, age, pregnancy, and immunosuppressed status. The management of neuroinvasive arbovirus disease is largely supportive and focuses on specific neurological complications. There is a need for therapeutics and currently, management is based on disease prevention and limiting zoonosis.
PubMed: 38711470
DOI: 10.1177/20503121241229847 -
Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi =... Apr 2024Objective To clarify the relationship between astrocyte activation patterns and disease progression in epidemic encephalitis B (Japanese encephalitis). Methods First, a...
Objective To clarify the relationship between astrocyte activation patterns and disease progression in epidemic encephalitis B (Japanese encephalitis). Methods First, a mouse model of epidemic encephalitis B was constructed by foot-pad injection of Japanese encephalitis virus (JEV), and the expression of viral protein NS3 in different brain regions was detected by immunofluorescence assay (IFA). Next, IFA, RNA sequencing (RNA-seq) and real-time quantitative PCR (qRT-PCR) were used to clarify the changes in the astrocyte activation patterns at different stages of epidemic encephalitis B. Finally, intracerebroventricular administration of irisin was conducted to regulate the proportion of activation in complement C3-positive A1 astrocytes and S100A10-positive A2 astrocytes, investigating whether it could improve the body mass, behavioral scores, and brain tissue damage in a mouse model. Results NS3 protein was detected by IFA predominantly in the M1/M2 region of the motor cortex and the hippocampus. The number and volume of GFAP-positive astrocytes significantly increased in JEV-infected brain regions, in which the expression of multiple genes associated with A1/A2 astrocyte activation was significantly enhanced. Although intracerebroventricular or intraperitoneal injection of irisin did not improve the prognosis of epidemic encephalitis B, it inhibited the activation of A1 astrocytes and ameliorate neuroinflammation. Conclusion Neurons in the M1/M2 motor cortex and hippocampus are susceptible to JEV infection, in which the abnormal astrocyte activation contributes to the neuroinflammatory injury. Irisin administration may restrain A1 astrocyte activation and alleviate neuroinflammation following JEV infection.
Topics: Animals; Astrocytes; Mice; Encephalitis, Japanese; Encephalitis Virus, Japanese; Disease Progression; Disease Models, Animal; Brain; Male; Fibronectins
PubMed: 38710514
DOI: No ID Found -
Journal of Neuroinflammation May 2024Macrophages play a pivotal role in the regulation of Japanese encephalitis (JE), a severe neuroinflammation in the central nervous system (CNS) following infection with...
BACKGROUND
Macrophages play a pivotal role in the regulation of Japanese encephalitis (JE), a severe neuroinflammation in the central nervous system (CNS) following infection with JE virus (JEV). Macrophages are known for their heterogeneity, polarizing into M1 or M2 phenotypes in the context of various immunopathological diseases. A comprehensive understanding of macrophage polarization and its relevance to JE progression holds significant promise for advancing JE control and therapeutic strategies.
METHODS
To elucidate the role of NADPH oxidase-derived reactive oxygen species (ROS) in JE progression, we assessed viral load, M1 macrophage accumulation, and cytokine production in WT and NADPH oxidase 2 (NOX2)-deficient mice using murine JE model. Additionally, we employed bone marrow (BM) cell-derived macrophages to delineate ROS-mediated regulation of macrophage polarization by ROS following JEV infection.
RESULTS
NOX2-deficient mice exhibited increased resistance to JE progression rather than heightened susceptibility, driven by the regulation of macrophage polarization. These mice displayed reduced viral loads in peripheral lymphoid tissues and the CNS, along with diminished infiltration of inflammatory cells into the CNS, thereby resulting in attenuated neuroinflammation. Additionally, NOX2-deficient mice exhibited enhanced JEV-specific Th1 CD4 and CD8 T cell responses and increased accumulation of M1 macrophages producing IL-12p40 and iNOS in peripheral lymphoid and inflamed extraneural tissues. Mechanistic investigations revealed that NOX2-deficient macrophages displayed a more pronounced differentiation into M1 phenotypes in response to JEV infection, thereby leading to the suppression of viral replication. Importantly, the administration of HO generated by NOX2 was shown to inhibit M1 macrophage polarization. Finally, oral administration of the ROS scavenger, butylated hydroxyanisole (BHA), bolstered resistance to JE progression and reduced viral loads in both extraneural tissues and the CNS, along with facilitated accumulation of M1 macrophages.
CONCLUSION
In light of our results, it is suggested that ROS generated by NOX2 play a role in undermining the control of JEV replication within peripheral extraneural tissues, primarily by suppressing M1 macrophage polarization. Subsequently, this leads to an augmentation in the viral load invading the CNS, thereby facilitating JE progression. Hence, our findings ultimately underscore the significance of ROS-mediated macrophage polarization in the context of JE progression initiated JEV infection.
Topics: Animals; Mice; Macrophages; NADPH Oxidase 2; Mice, Inbred C57BL; Mice, Knockout; Encephalitis, Japanese; Reactive Oxygen Species; Encephalitis Virus, Japanese; Neuroinflammatory Diseases; Cell Polarity
PubMed: 38698374
DOI: 10.1186/s12974-024-03078-8 -
Travel Medicine and Infectious Disease Apr 2024Japanese encephalitis (JE) is a serious health concern in China, with approximately 80 % of global infections occurring in China. To develop effective prevention and...
BACKGROUND
Japanese encephalitis (JE) is a serious health concern in China, with approximately 80 % of global infections occurring in China. To develop effective prevention and control strategies, this study explored the epidemiological characteristics of JE in China based on spatiotemporal data, to understand the patterns and trends of JE incidence in different regions and time periods.
METHOD
The incidence and mortality rates of JE were extracted from the Public Health Data Center, the official website of the National Health Commission of the People's Republic of China, and the National Notifiable Infectious Disease Surveillance System from 2004 to 2019. Joinpoint regression was applied to examine the spatiotemporal patterns and annual percentage change in incidence and mortality of the JE.
RESULTS
From 2004 to 2019, a total of 43,569 cases of JE were diagnosed, including 2081 deaths. The annual incidence rate of JE decreased from 0.4171/100,000 in 2004 to 0.0298/100,000 in 2019, with an annual percentage change (APC) of -13.5 % (P < 0.001). The annual mortality rate of JE showed three stages of change, with inflection points in 2006 and 2014. The incidence and mortality rates of JE have declined in all provinces of China, and more cases were reported in 0-14 years of age, accounting for nearly 80 % of all patients.
CONCLUSIONS
The morbidity and mortality rates of JE in China are generally on a downward trend, and emphasis should be placed on strengthening disease surveillance in special areas and populations, popularizing vaccination, and increasing publicity.
PubMed: 38692338
DOI: 10.1016/j.tmaid.2024.102724 -
The Journal of Infectious Diseases Apr 2024We explored the impact of prior Yellow fever (YF) or Japanese encephalitis (JE) vaccination on the efficacy of Takeda's dengue vaccine candidate, TAK-003 (NCT02747927).
BACKGROUND
We explored the impact of prior Yellow fever (YF) or Japanese encephalitis (JE) vaccination on the efficacy of Takeda's dengue vaccine candidate, TAK-003 (NCT02747927).
METHODS
Children 4-16 years of age were randomized 2:1 to receive TAK-003 or placebo and were under active febrile surveillance. Symptomatic dengue was confirmed by serotype-specific RT-PCR. YF and JE vaccination history was recorded.
RESULTS
Of the 20,071 children who received TAK-003 or placebo, 21.1% had a YF and 23.9% had a JE vaccination history at randomization. Fifty-seven months after vaccination, vaccine efficacy was 55.7% (95% CI, 39.7%-67.5%) in those with YF vaccination, 77.8% (70.8%-83.1%) for JE vaccination, and 53.5% (45.4%-60.4%) for no prior YF/JE vaccination. Regional differences in serotype distribution confound these results. The apparent higher vaccine efficacy in the JE vaccination subgroup could be largely explained by serotype-specific efficacy of TAK-003. Within 28 days of any vaccination, the proportions of participants with serious adverse events in the YF/JE prior vaccination population were comparable between the TAK-003 and placebo groups.
CONCLUSIONS
The available data do not suggest a clinically relevant impact of prior JE or YF vaccination on TAK-003 performance. Overall, TAK-003 was well-tolerated and efficacious in different epidemiological settings.
PubMed: 38682569
DOI: 10.1093/infdis/jiae222 -
Veterinary Microbiology Jun 2024Japanese encephalitis virus (JEV) is a pathogen with a substantial impact on both livestock and human health. However, the critical host factors in the virus life cycle...
Japanese encephalitis virus (JEV) is a pathogen with a substantial impact on both livestock and human health. However, the critical host factors in the virus life cycle remain poorly understood. Using a library comprising 123411 small guide RNAs (sgRNAs) targeting 19050 human genes, we conducted a genome-wide clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9-based screen to identify essential genes for JEV replication. By employing knockout or knockdown techniques on genes, we identified eleven human genes crucial for JEV replication, such as prolactin releasing hormone receptor (PRLHR), activating signal cointegrator 1 complex subunit 3 (ASCC3), acyl-CoA synthetase long chain family member 3 (ACSL3), and others. Notably, we found that PRLHR knockdown blocked the autophagic flux, thereby inhibiting JEV infection. Taken together, these findings provide effective data for studying important host factors of JEV replication and scientific data for selecting antiviral drug targets.
Topics: Virus Replication; Encephalitis Virus, Japanese; Humans; CRISPR-Cas Systems; RNA, Guide, CRISPR-Cas Systems; Gene Library; Animals; Host-Pathogen Interactions; Encephalitis, Japanese; Cell Line; HEK293 Cells; Clustered Regularly Interspaced Short Palindromic Repeats
PubMed: 38677125
DOI: 10.1016/j.vetmic.2024.110099